If one is protesting an unjust law, and is willing to accept the consequences, it's ok to break it. This does not apply to things like bank robbery or murder obviously. I'd also say if a law is unenforced, it's also ok, as that means no one particulary cares about it. Besides, there are some strange laws on the books in many places.
What was that about copyright infringement? Hey! What's that behind you?!! *Dash*